Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e183d169205e00…

MALICIOUS

PDF

78.3 KB Created: 2020-07-29 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a74b30fa88b877ab60304160d0fb8d SHA-1: 6a929c9ef985603eebbeee29c837b053d02569b0 SHA-256: 59e183d169205e00455075bbebecfbe29ce36dcc0a129793c7d528a984529dc1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure via 'ttraff.com'. Another critical heuristic identified a PDF link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=bicameral+and+unicameral+legislature+pdf
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdf
    • http://files.chriskato.com/uploads/1/3/1/4/131408970/185323.pdf
    • http://files.theuniform.store/uploads/1/3/0/9/130970003/8792577.pdf
    • http://files.artandroulla.com/uploads/1/3/1/3/131380773/6e51b943ebb202b.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/lebigaluxefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/87261311379.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/mazewatifurixovexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/11956688828.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/donogun.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/tapezadojijasulijun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/wopunawujigilimelemututun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/godubuzikaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/jutogasudilutunukezemipos.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/losireluzopovur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/wugukuxavezirobivekodud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin
d766e3396b3542bb6e086d90c6b1a3482046973c1e07199bb172034ec59499af
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5296 bytes
font_01_sfnt_off0001002d.bin
1671b22ffb4845e82a6811426119d8cf5b85e7f1b56fcb57011da18bad591598
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 13632 bytes